¹ Du machst dieses Leben Wert = You make this life worth; however, I’m treating “Leben Wert” as a play on words for “Lebenswert,“ which means “worth living.“
² Straight translation: Für mich bist du das schönste Monopol = For me, you are the finest monopoly; however, I think “the only one with patent rights” is what’s meant.
³ Straight translation: Du machst jeden Faden rot = you make every thread red. This is a German saying: roter Faden = recurring theme, central theme.
⁴ Straight translation: Du machst alles halb so schwer = You make everything half as difficult. As confusing as it may seem, making something “twice as easy” has the same meaning.

Patent rights are different from a monopoly- you may want to leave that bit the way it is, as though they both sound strange monopoly sounds less so and is closer to the meaning. It makes more sense with the next line, having no competition, as well.

Also you could leave half as difficult the way it is, or phrase it half as hard- that is not a strange thing to say at all and doesn't need to be changed to twice as easy.